Electric motor.



J. BURKE.

ELECTRIC MOTOR. I

7 APPLICATION FILED MAR. 14, 1906.

1,026,904, I Patented May 21, 1912 2 SHEETS-SHEET 1. 1 /5! J. BURKE.

ELECTRIC MOTOR.

APPLICATION FILED MR. 14

' Patented May 21, 1912.

2 SHEBTB-BHEET 2.

Jmns BURKE, or ERIE, PENNSYLVANIA,

ASSIGNQB TO BURKE ELECTRIC COMI'ALN'FZ',

A CORPORATIdN OF PENNSYLVANIA.

ELECTRIC MOTOR.

Specification of Letters Iatent.

Patente May 2 1 191% Application flied March 14, 1908. Serial No. 305,978.

To all whom it may concern:

Be it known that-I, JAMES BURKE, a citizen of the UnitedStates, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements .in Electric Motors, of which the-following is a full, clear, and exact specification.

My invention relates to dynamo electric machines, and to various features of construction which in the present instance are shown and described in connection with an electric motor which is portable and adapted for use as a blower.

Among the objects of my invention is the rovision of a motor which shall be simple in construction, compact, well protected, light, portable and efficient. My improved motor is also readily accessible to all parts.

It is common practice where sufficient air pressure is available to clean dust and loose particles from exposed surfaces by means of an air blast. An example of this use is found in manufacturing establishments where the product, such as a dynamo, must be thoroughly cleaned throughout before finishing andbctore shipment. In such cases the air supply for pneumatic tools is often used but this practice is objection able owing to the comparatively few outlets available and to the objection of usin long flexible piping subjected to the hig pressure. In most instances, however, no air supply is available. By my invention an air blast of considerable force is obtained by electric means and the motor is welladapted for connection to any convenient point of the electric suppl circuit and may even be used at a C0]lSi(1tll)l8 distance from the main circuit by lengthening the lead wires.

My invention will be understood from the following description and drawings, and the novelty thereof will be more definitely indicated by the appended .claims.

Figure 1 is a side view of a motor embodying my invention; Fig. .2 is a longitudinal section on the line 22 ot' Fig. 3 with the armature andsomc parts 111 elevation; Fig. 8 is a section on the line 3 ----3 ot' Fig.9;

Fig. i is a section of parts on line 4 -4 of Fig. 2; and Fig. 5 is an end view with a part of the end cover plate broken away.

The motor comprises a cylindrical iron casing 1 made in one piece and has Integral therewith at one end the a ms 2, 2. The

' latter form a support for ball beerings li,

a screw pasoi n through them to -their snpr ports 10, this atter in the form. of m l pressedinwardly by springs 11 each wound around; a pm and having one end fined and theother' pressing against the support it bio for flexible connection 9 is usually do.

brush to the terminal and without the noses sity of current passing through the spring. In the outer end of the bracket '3 a qr it act-mg controlling switch 12 which is inditype and having a protecting cover The and stop the motor. "The motor is shownas bl-polar having removable pole pieces 1 adapted to retain the field coils 15 in position. The letters-re curved so as to conform to the shape of the cylindrical frame.

At one end of the cylindrical frame is a the screws 17 and nicely fitted there-to. The

shown in Fig. 3. Over the outer end of the casing 16 is secured a cover plate 18 havii at its lower end an outlet pipe 19. T central part of the plate 18 is provided with a circular opening in which fitted a screen 20. On the extended shaft of the armature is screwed a support having a scriesoit fan.

blades 21 curved as shown, and consequently when the motor is in motion. air will be drawn in through the central opening-of plate 18 and discharged through the outlet '19 with great force. Referring to 5, it

of rotation is opposite tothe movement of the hands of a clock, and it will be seen that the blades 21 are curved or inclined in the direction of rotation from the center outwardly. This inclination of the blades stri s bent over the outer ends of the brushes as s ownrn Fig. 4. The brushes are spring each support being pivoted on the pm. (the securing a good electrical path from the will be understood that the proper direct-ion in which the armature is journaiedf The openings 7. The brushes 9 are secured by lit] cated in general as a snap switch of common turning of this switch is adapted to start and pole tips or extensions which are wel casing 16 removably secured to the frame by outline of this casing is of spiral form as is important to obtain the most efiicient results,.and' the air will have greater force with the blades inclined in the direction shown than when inclined in the opposite direction, or when radial. Fixed to the cy-- lindrical frame 1 is ahandle 22 shown hollowed and preferably made of aluminum for rent passin connects to one terminal of a field coil 15,

' and from this coil the circuit is completed through the other field coil and thence to a terminal 26, mounted on an insulating block 27 fixed within the frame 1. A yieldable metal contact strip 28 extends out toward and engages a similar contact strip 29 fixed to one of the brush terminals. The path of the current is completed through the armature to the other brush terminal, thence by a lead 30 through a hole in the end casing 7 to the switch 12 and thence by a connection 31 to an insulated contact strip 32 mounted on the casing 7, which stri engages a similar strip 33 mounted on rame 1 and from which connection is made toenoutside lead wire. In removing the casing 7, the electrical connections of the parts are thus conveniently made andbrolren. To remove the armature and field poles, the casing 7 will be removed and also the plate 18;

the fan blades ma then be unscrewed. from the armature sha t which leaves the ELIHIH.

two free.

Having thus described my '1nV611t1OI1,'I

I declare that what I claim as new and desire to secure by Letters Patent, is',- 1. In an electric motor, the combination of a field frame having internally projecting field poles with field exciting coils therev on, a removable blower casing at one end latter casing, a control switch carried by the latter casing, and a separable connector for making electric connections with the motor terminals when the removable casing is applied. J

2. In an electric motor, the combination of a field frame having internal poles and field coils thereon, a removable blower casing at one end of the field'frame, an armature connected to the rotary element of the blower within said casing, a removable cas ing at the other end of the field frame, a control switch carried thereb separable terminals carried respectively y said removable casing and the field frame, and current supply leads to the motor windings led through the field casing.

3. A combined portable blower and electric motor provided with a removable end cap carrying commutator brushes, an automatlc circuit connecting device for establishing the field connections of the motor when the cap is applied, a centrifugal blower with a central air -intake mounted on the field frame of the motor, current supply leads through said field frame, and a control switch on the end cap.

4. A combined portable blower and electric motor having connections with a source of current supply, a removable end cap carrying commutator brushes and a control switch, two fixed terminals secured to the motor casing, two cooperating terminals carried by the cap for automatically completing the motor connections when the cap is applied, a blower casin applied to the other end of the motor, am? a rotary blower element within said casing secured to the armature shaft. 5. In an electric motor, the combination of a field frame having a bearing for the armature shaft at one end. of said frame, a removable casing at the other end of said frame and having a bearing for the armature shaft, brushes carried by said casing and yieldable contact terminals mounted on said frameand also on said casing adapted to engage each other when said casing is in place for making the main circuit connections.

6. In an electric m'otor,.the combination of a cylindrical field frame having a bearing i for the armature shaft at one end, a blower casing removably secured to said frame at one end thereof, a fan within saidcasing and carried by the armature shaft, a second casing rem ovably secured to the opposite end of said frame, brushes carried by said second casing, a switch for starting and stopping the motor also carried and inclosed by said second casing, and contact terminalscarried by and inclosed byysaid frame and also by said second casing and adapted to engage each other when said casing is in place foimaking the main circuit connections.

In testimon whereof I aflix my signature, in presence 0 two witnesses.

- Witnesses:

GEo. N. KERR, Gro. A. IIOFFMAN.

JAMES BURKEVQ 

